Breguet Type XXI Flyback Chronograph

When the hammer came down on lot 79 at Christie’s December 14 New York auction, an unassuming Patek Philippe pocket watch with a pre-sale estimate of $40,000 to $60,000 had reached $242,500. The watch, manufactured in 1913, received a Geneva Observatory rating certificate in 1920 and was delivered to its American retailer in 1921. In 1925, it was purchased by American super-collector Henry Graves. The 50mm diameter watch with enamel dial has hours, minutes, subsidiary seconds, and an up-do........

ok i have had this seamaster for 2 years . It never gains time only looses some secs;) . Once i fully wind it , it will not gain or loose any seconds for 24 hours. After that it starts loosing 2-3 secs daily till it gets to the point where it stays at -12secs no matter what;) It has been always running at -12 secs steady .is it accurate?i have the cosc certification . It says that dial up will make it gain 4 secs. I left it dial up for 20h but did not gain anythingvertical 6 o clock up = M1 2.0........